In trying to curb malaria, biologists and epidemiologists have pulled
some dirty tricks on mosquitoes (some quite literally dirty; remember
the dirty sock trap from last week?). But after all the genetic tinkering to make mosquitoes disease resistant and the laser and nano-attacks that kill the insects on the wing, this one might be the meanest of all: a genetic trick that blocks mosquitoes’ ability to digest blood.

Not that we’re taking the mosquitoes side or anything like that--we
don’t like them either, especially the malaria- and yellow fever-bearing
bugs--but just imagine: You’ve just come back from your local haunt
with a belly full of your favorite comfort food, when suddenly you find
your self doubled over, bloating, and dying. It’s no way to go.

Nonetheless,
it could make for an effective means of thinning out mosquito
populations, at least among the females that carry the malaria parasite
(and also handle the more important part of the breeding process).
Mosquitoes generally feed on nectar, but when it’s time to breed the
females need protein. That means blood, which digests a bit differently
than other stuff. To digest blood, mosquitoes need to produce a certain
enzyme in their guts. Researchers simply switched off the genes that
lead to the production of those enzymes, and let nature take its course.